Because this equation has complex roots, you need to use complex numbers. The easiest way is to use the quadratic formula
This will give you (-3 +/- (-23)1/2 ) / 8.
Thus, the answer is -3/8 + i(23)1/2 and -3/8 - i(23)1/2
Giving you factors of (x + (3/8 + i(23)1/2 ))(x + (3/8 - i(23)1/2))
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(3x - y)(3x - 5y) and (2x + 1)(2x + 11)
-((4x + 1)(x - 1))
4x2+3x+6+5x+3x+6 = 4x2+11x+12 when simplified
(x + 3)(3x - 2)
20x2 - 3x + 10 does not have any real factors.